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6:15 PM
What Happens To My Lungs When I Smoke? - Thursday, March 10, 2011
Every time you inhale smoke from a cigarette, you kill some of the air sacks in your lungs, called alveoli. These air sacks are where the oxygen that you breathe in is transferred into your blood. Alveoli don't grow back, so when you destroy them, you have permanently destroyed part of your lungs. This means that you won't do as well in activities where breathing is important, like sports, dancing, or singing.
Smoking paralyzes the cilia that line your lungs. Cilia are little hairlike structures that move back and forth to sweep particles out of your lungs. When you smoke, the cilia can't move and can't do their job. So dust, pollen, and other things that you inhale sit in your lungs and build up. Also, there are a lot of particles in smoke that get into your lungs. Since your cilia are paralyzed because of the smoke and can't clean them out, the particles sit in your lungs and form tar.

Source of information: http://www.youngwomenshealth.org/smokeinfo.html :)

-YangYao